1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// RUN: %clang_cc1 -std=c23 -E %s | FileCheck %s
/* WG14 N3033: Clang 12
* Comma ommission and deletion (__VA_OPT__)
*/
#define F(...) f(0 __VA_OPT__(,) __VA_ARGS__)
#define G(X, ...) f(0, X __VA_OPT__(,) __VA_ARGS__)
#define SDEF(sname, ...) S sname __VA_OPT__(= { __VA_ARGS__ })
#define EMP
F(a, b, c) // replaced by f(0, a, b, c)
// CHECK: f(0 , a, b, c)
F() // replaced by f(0)
// CHECK: f(0 )
F(EMP) // replaced by f(0)
// CHECK: f(0 )
G(a, b, c) // replaced by f(0, a, b, c)
// CHECK: f(0, a , b, c)
G(a, ) // replaced by f(0, a)
// CHECK: f(0, a )
G(a) // replaced by f(0, a)
// CHECK: f(0, a )
SDEF(foo); // replaced by S foo;
// CHECK: S foo ;
SDEF(bar, 1, 2); // replaced by S bar = { 1, 2 };
// CHECK: S bar = { 1, 2 };
//#define H1(X, ...) X __VA_OPT__(##) __VA_ARGS__ // error: ## may not appear at the beginning of a replacement list (6.10.3.3)
#define H2(X, Y, ...) __VA_OPT__(X ## Y,) __VA_ARGS__
H2(a, b, c, d) // replaced by ab, c, d
// CHECK: ab, c, d
#define H3(X, ...) #__VA_OPT__(X##X X##X)
H3(, 0) // replaced by ""
// CHECK: ""
#define H4(X, ...) __VA_OPT__(a X ## X) ## b
H4(, 1) // replaced by a b
// CHECK: a b
#define H5A(...) __VA_OPT__()/**/__VA_OPT__()
#define H5B(X) a ## X ## b
#define H5C(X) H5B(X)
H5C(H5A()) // replaced by ab
// CHECK: ab
|
